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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ace149f1f06cbaddf1adc66b3bfc256390c82ee1fc0ae7f720a0cc08dc8ae88' 
  AND token = 'DvHfHtziHCwcTKH6y3R1zgxEkOTfkoOk8CvHm3hOn/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}